Model 282 - Teledyne Hastings Instruments

1.0 GENERAL INFORMATIONThis manual contains technical and general information concerning the installation, operation and calibration of the HastingsHVC-282 Vacuum Gauge, and associated components.For proper operation, the Hastings HVC-282 Vacuum Gauge must be suitably connected to a Hastings Model DV-273 GaugeTube. Attempting to use this Vacuum Gauge with any other transducer may damage the gauge and or transducer.1.1 Description:The HVC-282 vacuum instrument offers a digital readout of 0-20 Torr with 0.01 Torr resolution with two adjustable set pointrelays, using a international input power supply for 115/220VAC 50/60Hz operation depending on internal switch configuration(Please see Sec. 4.0), all in a standard Hastings VT Gauge unit. The DV-273 Hastings gauge tube is rugged butsensitive, specifically made for this range, and matched for interchangeability without recalibration giving extra versatility forall vacuum applications. Tubes are temperature compensated, but do respond to large ∆T transients, requiring insulatingtubes to reduce temperature transients.1.2 Operating Principle:Operation of the HVC-282 Vacuum Gauge is based on a low voltage DC bridge which heats a noble metal thermopile. Achange in pressure creates a change in the thermal conductivity of gas surrounding the thermopile, thus at vacuum, littlepower is used to heat the thermopile and at full scale requires maximum power. Power level is indicative of vacuum levelpresent in tube.1.3 Specifications:Range/ Resolution .................................................................................................................. 0-20 Torr/0.01 TorrReadout ......................................................................................................................... 3 1/2 digit LCD display.Linear Output .................................................................................. 0-2VDC ±5% & 3mV with fine span adjustment.Set Points ..................................................0- 20 Torr/0.01 Torr, stability of ±3 counts over 0 0 to 50 0 Coperational range.Accuracy ...................................................................... ±5% of reading & ±3 counts. Gauge tube must be protectedfrom large temperature transients. (See 3.2)Repeatability ................................................................. ±1% of reading & ±3 counts. Gauge tube must be protectedfrom large temperature transients. (See 3.2)Power Requirements ................................................. 115VAC ±15V or 220VAC ±30V (Selectable) 50/60Hz